Different length scales for order parameters in two-gap superconductors : extended Ginzburg-Landau theory
Different length scales for order parameters in two-gap superconductors : extended Ginzburg-Landau theory
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DOI：
10.1103/physrevb.84.064522
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发表时间：
2011-06
影响因子：
3.7
通讯作者：
L. Komendov'a;M. Milovsevi'c;A. Shanenko;F. Peeters
中科院分区：
文献类型：
--
作者：
L. Komendov'a;M. Milovsevi'c;A. Shanenko;F. Peeters
使用扩展到次领先阶的金兹堡-朗道理论，我们以数值方式确定了两间隙超导体/普通金属界面处的二阶参数的愈合长度。我们通过几个例子证明，即使在金兹堡-朗道理论的严格适用范围内，这些也可能有显着不同。这证明了使用该理论来描述双能隙超导体的相关物理现象，并将其与单能隙超导体区分开来。与传统的 Ginzburg-Landau 展开相比，计算的复杂程度仅略有增加，因此与完整的微观方法相比，扩展的 Ginzburg-Landau 模型在数值上的要求仍然要低得多。
Using the Ginzburg-Landau theory extended to the next-to-leading order we determine numerically the healing lengths of the two order parameters at the two-gap superconductor/normal metal interface. We demonstrate on several examples that those can be significantly different even in the strict domain of applicability of the Ginzburg-Landau theory. This justifies the use of this theory to describe relevant physics of two-gap superconductors, distinguishing them from their single-gap counterparts. The calculational degree of complexity increases only slightly with respect to the conventional Ginzburg-Landau expansion, thus the extended Ginzburg-Landau model remains numerically far less demanding compared to the full microscopic approaches.